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With what speed should a star move with ...

With what speed should a star move with respect to us so that the beam at wavelength 460.0 nm is observed at 460.8 nm.

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Now we have,
`(Deltav)/v=-(Deltalambda)/(lambda)=(-v_("radial"))/c`
Now, `Deltalambda=(460.8-460.0)nm=0.8 nm`
Now, `v_("radial")=(cDeltalambda)/(lambda)`
`=(3xx10^(8)xx0.8nm)/(460 nm)`
`=5.217xx10^(5) m//s`
`~=5.21.7 km//s`
Since, v comes out to be positive, hence we can conclude that the star is moving away from us.
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